User:Donlubin/Polypodium x incognitum

Polypodium X incognitum is a native fern in New England USA. It is triploid with parents P. appalachianum (diploid) and P. virginianum (tetraploid). Its morphology, while intermediate between those of its parents, overlaps them both so thoroughly that it may be identified only in autumn when spores are released. The hybrid spores are whitish, of varied sizes and shapes, often opaque, whereas spores of the parent species are amber colored, of homogeneous size and plump reniform shape.

See scans of the 3 taxa with links to discussion.